Persistent Bitwarden UI and maintain unsaved data

@richb-hanover I have moved your comments about fixing the nonpersistent UI state into the existing feature request thread, so that the beta feedback thread about the new extension UI can stay focused on UI design matters. You did receive a response from Bitwarden there, indicating that work towards a persistent UI for the extension is currently in progress:

In the meantime, the new pop-out buttons on the Edit screen should help mitigate the issue.